CN101742682A - Random access method between terminal and base station in LTE system - Google Patents
Random access method between terminal and base station in LTE system Download PDFInfo
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Abstract
The invention relates to a random access method between a terminal and a base station in an LTE system, belonging to the technical field of mobile communication. In the random access method in the LTE system, a terminal sends a random access precursor on a physical random access channel and then receives a random access response message in a specified receiving time window. The random access method is characterized in that the terminal monitors a physical downlink control channel related to the random access response message; the physical downlink control channel comprises a radio network temporary mark; and the radio network temporary mark is equal to the sum of a resource index of the physical random access channel sending the random access precursor and an off-set value. The random access method decreases the resources of a reserved RA-RNTI, reduces the complexity of interoperate between an MAC layer and a physical layer and simplifies the process that the MAC layer processes the RA-RNTI.
Description
Technical field
The present invention relates to the mobile communication technology field, relate in particular in the LTE system accidental access method between the terminal and base station.
Background technology
The process that inserts at random in LTE Long Term Evolution (Long Term Evolution abbreviates LTE as) as shown in Figure 1, mainly comprises two steps:
Step 1: terminal goes up at Physical Random Access Channel (PRACH) and sends random access guiding
Step 2: terminal is waited in the time of reception window of regulation and is received the accidental access response message that the base station sends then
For the ease of understanding the step of two above-mentioned random access procedures, below at first the configuration of access at random and the frequency domain multiplexing and the mapping etc. of the frame structure in the LTE system, leading form, LTE system are briefly introduced.
The frame structure that two types are arranged in the LTE system, i.e. Type 1 and Type 2, wherein, Type 1 frame structure can be applied to fdd mode, and Type 2 frame structures can be applicable to tdd mode.Wherein, the frame structure of Type 1 and Type 2 is respectively as Fig. 2 A Fig. 2 B, and shown in Fig. 2 A or Fig. 2 B, in the LTE frame structure, the radio frames of a 10ms is divided into the field of two 5ms, and each field is made up of the subframe of 5 1ms.Except that the special subframe of Type 2 frame structures, other subframe all is made up of the time slot of two 0.5ms.Special subframe among the Type2 is by descending pilot frequency time slot (Downlink Pilot Time Slot; abbreviate DwPTS as), protection (Guard Period at interval; abbreviate GP as) and 3 special time slots compositions of uplink pilot time slot (Uplink Pilot Time Slot abbreviates UpPTS as).In the LTE frame structure, on one/duration of descending symbol is 66.7us, on each/all can attach before the descending symbol Cyclic Prefix (Cyclic Prefix, CP).Two kinds of Cyclic Prefix in LTE, have been defined: regular circulation prefix (Normal CP) and extended cyclic prefix (Extended CP), for length is the regular circulation prefix of 5.21us and 4.69us, time slot comprises on 7/descending symbol, wherein first symbol cyclic prefix length is 5.21us, and the circulating prefix-length of all the other 6 symbols is 4.69us; For length is the extended cyclic prefix of 16.67us, and time slot comprises on 6/descending symbol.
In Type 2 frame structures, subframe 0,5 and DwPTS are used for downlink transfer all the time, and subframe 2 and UpPTS are used for uplink all the time.When 2 downstream-to-upstream transfer points were arranged in the 10ms, subframe 7 also was used for uplink.It is to be used for uplink that other subframe is decided by the uplink and downlink configuration, still is used for downlink transfer.The set of present uplink and downlink proportional arrangement is as shown in table 1, has 7 kinds of uplink and downlink configurations, and wherein the D subframe, the U that represent the to be used for downlink transfer subframe, the S that represent to be used for uplink represents special subframe, comprised DwPTS, GP and UpPTS.And different frequency resources is adopted in Type 1 frame structure up-downgoing, so the number of sub frames of up-downgoing is always identical.
The set of table 1L TE TDD up-downgoing proportional arrangement
Switch-point Subframee number (subframe numbers)
Configuration
periodicity
(config. number) 0123456789
(transfer point cycle)
0 5ms D S U U U D S U U U
1 5ms D S U U D D S U U D
2 5ms D S U D D D S U D D
3 10ms D S U U U D D D D D
4 10ms D S U U D D D D D D
5 10ms D S U D D D D D D D
6 5ms D S U U U D S U U D
The structure of PRACH channel as shown in Figure 3 in the LTE system.One leading (preamble) is made up of CP and sequence (Sequence) two parts, the CP of different leading form (preamble format) and/or Sequence length difference.The preambleformat kind that present LTE system TDD mode and fdd mode are all supported is as shown in table 2.
The leading form of table 2
Preamble format (leading form) TCP TSEQ
0 3168·Ts 24576·Ts
1 21024·Ts 24576·Ts
2 6240·Ts 2·24576·Ts
3 21024·Ts 2·24576·Ts
4
448·Ts 4096·Ts
(this form only is applied to tdd mode)
In the above-mentioned leading form, preamble format 0-3 transmits in the common sub-frame of uplink of TDD or FDD system, and preamble format 4 transmits in the UpPTS of TDD system, and, wherein,
At frequency domain, above-mentioned various PRACH account for 6 Resource Block (Resource Block abbreviates RB as), and each RB comprises 12 subcarriers, and the bandwidth of each subcarrier is 15kHz.The configuration of access at random of LTE FDD and TDD system is respectively as table 3, shown in 4:
Table 3.LTE FDD inserts configuration at random
Table 4.LTE TDD system inserts configuration at random
Each configuration index that inserts at random (PRACH Configuration Index) all corresponding the combination of a cover configuration parameter, concerning TDD, indicate the leading form of following content: PRACH, PRACH density (disposing how many bar PRACH channels in each radio frames), version number's (in the tdd mode, what this index provided is the version number of several different mappings modes of time domain) of time domain configuration and the initial subframe of each PRACH are in the position and the frequency domain sequence number of time domain.For format4, the initial subframe of PRACH refers to UpPTS place subframe.Concerning FDD, indicate the leading form of following content: PRACH, the subframe numbers of radio frames interval (per 2 or each radio frames) and the initial subframe of PRACH.Configuration index is notified to terminal by broadcast.For LTE FDD system, have only a PRACH channel on the frequency domain at most, a radio frames can comprise 10 PRACH channels at most, all on time domain, separate, concrete time-domain position is provided by table 3, and PRACH channels all on the frequency domain position are identical, by the unified configuration in base station.For LTE TDD system, each radio frames can comprise 6 PRACH channels at most, the PRACH channel Mapping is the manner of formulation of frequency domain after the first time domain, can't not carry the PRACH density of configuration inadequately in time domain under the prerequisite of overlapping PRACH by time-domain multiplexed when the time domain resource, can be on frequency domain multiplexing many PRACH channels, so can comprise 6 PRACH channels on the frequency domain at most.
In the LTE TDD system, corresponding to the PRACH configuration of table 4, under the different uplink-downlink configuration shown in the table 1, the position of the time domain of required each comfortable ascending resource of PRACH channel mapping is as shown in table 5, and the presentation format of the four-tuple in the table is (f
RA, t
RA 0, t
RA 1, t
RA 2), indicating a certain physical resource that inserts at random, just indicate a certain PRACH channel, wherein f
RABe illustrated in by (t
RA 0, t
RA 1, t
RA 2) certain PRACH channel is just represented which bar PRACH channel of frequency domain on this time-domain position, f at the index of frequency domain on the time-domain position of appointment
RA∈ 0,1,2,3,4,5}.
Indicate respectively certain PRACH be each radio frames or only the radio frames of even number or only in the radio frames at odd number by (t
RA 1, t
RA 2) resend again on the position in the frame of indication.
Indicating certain PRACH respectively is first field or second field that is positioned at a radio frames.For the PRACH channel of configuration use preamble format 0-3, t
RA 2The numbering of the sub-frame of uplink at the time domain mapping starting point place of expression PRACH channel in first field or second field, this numbering is compiled in proper order since 0, and No. 0 correspondence first sub-frame of uplink except that UpPTS in each field; Use the PRACH channel of Preamble format 4 always to be configured among the UpPTS, at this moment t in the form
RA 2Just be expressed as (*).
The Random Access Channel of table 5 LTE TDD is in the mapping of time domain and frequency domain
PRACH UL/DL?configuration(See?Table?4.2-2)
conf. 0 1 2 3 4 5 6
Index
(See
Table
5.7.1-3
)
0 (0，1，0， (0，1，0， (0，1，0， (0，1，0， (0，1，0， (0，1，0， (0，1，0，
2) 1) 0) 2) 1) 0) 2)
1 (0，2，0， (0，2，0， (0，2，0， (0，2，0， (0，2，0， (0，2，0， (0，2，0，
2) 1) 0) 2) 1) 0) 2)
2 (0，1，1， (0，1，1， (0，1，1， (0，1，0， (0，1，0， N/A (0，1，1，
2) 1) 0) 1) 0) 1)
3 (0，0，0， (0，0，0， (0，0，0， (0，0，0， (0，0，0， (0，0，0， (0，0，0，
2) 1) 0) 2) 1) 0) 2)
4 (0，0，1， (0，0，1， (0，0，1， (0，0，0， (0，0，0， N/A (0，0，1，
2) 1) 0) 1) 0) 1)
5 (0，0，0， (0，0，0， N/A (0，0，0， N/A N/A (0，0，0，
1) 0) 0) 1)
6 (0，0，0， (0，0，0， (0，0，0， (0，0，0， (0，0，0， (0，0，0， (0，0，0，
2) 1) 0) 1) 0) 0) 2)
(0，0，1， (0，0，1， (0，0，1， (0，0，0， (0，0，0， (1，0，0， (0，0，1，
2) 1) 0) 2) 1) 0) 1)
7 (0，0，0， (0，0，0， N/A (0，0，0， N/A N/A (0，0，0，
1) 0) 0) 1)
(0，0，1， (0，0，1， (0，0，0， (0，0，1，
1) 0) 2) 0)
8 (0，0，0， N/A N/A (0，0，0， N/A N/A (0，0，0，
0) 0) 0)
(0，0，1， (0，0，0， (0，0，1，
0) 1) 1)
9 (0，0，0， (0，0，0， (0，0，0， (0，0，0， (0，0，0， (0，0，0， (0，0，0，
1) 0) 0) 0) 0) 0) 1)
(0，0，0， (0，0，0， (0，0，1， (0，0，0， (0，0，0， (1，0，0， (0，0，0，
2) 1) 0) 1) 1) 0) 2)
(0，0，1， (0，0，1， (1，0，0， (0，0，0， (1，0，0， (2，0，0， (0，0，1，
2) 1) 0) 2) 1) 0) 1)
10 (0，0，0， (0，0，0， (0，0，0， N/A (0，0，0， N/A (0，0，0，
0) 1) 0) 0) 0)
(0，0，1， (0，0，1， (0，0，0， (0，0，0，
0) (0，0，1， 0) 1) 2)
(0，0，1， 0) (1，0，1， (1，0，0， (0，0，1，
1) (0，0，1， 0) 0) 0)
1)
11 N/A (0，0，0， N/A N/A N/A N/A (0，0，0，
0) 1)
(0，0，0， (0，0，1，
1) 0)
(0，0，1， (0，0，1，
0) 1)
12 (0，0，0， (0，0，0， (0，0，0， (0，0，0， (0，0，0， (0，0，0， (0，0，0，
1) 0) 0) 0) 0) 0) 1)
(0，0，0， (0，0，0， (0，0，1， (0，0，0， (0，0，0， (1，0，0， (0，0，0，
2) 1) 0) 1) 1) 0) 2)
(0，0，1， (0，0，1， (1，0，0， (0，0，0， (1，0，0， (2，0，0， (0，0，1，
1) 0) 0) 2) 0) 0) 0)
(0，0，1， (0，0，1， (1，0，1， (1，0，0， (1，0，0， (3，0，0， (0，0，1，
2) 1) 0) 2) 1) 0) 1)
13 (0，0，0， N/A N/A (0，0，0， N/A N/A (0，0，0，
0) 0) 0)
(0，0，0， (0，0，0， (0，0，0，
2) 1) 1)
(0，0，1， (0，0，0， (0，0，0，
0) 2) 2)
(0，0，1， (1，0，0， (0，0，1，
2) 1) 1)
14 (0，0，0， N/A N/A (0，0，0， N/A N/A (0，0，0，
0) 0) 0)
(0，0，0， (0，0，0， (0，0，0，
1) 1) 2)
(0，0，1， (0，0，0， (0，0，1，
0) 2) 0)
(0，0，1， (1，0，0， (0，0，1，
1) 0) 1)
15 (0，0，0， (0，0，0，?(0，0，0， (0，0，0， (0，0，0， (0，0，0， (0，0，0，
0) 0) 0) 0) 0) 0) 0)
(0，0，0， (0，0，0，?(0，0，1， (0，0，0， (0，0，0， (1，0，0， (0，0，0，
1) 1) 0) 1) 1) 0) 1)
(0，0，0， (0，0，1，?(1，0，0， (0，0，0， (1，0，0， (2，0，0， (0，0，0，
2) 0) 0) 2) 0) 0) 2)
(0，0，1， (0，0，1，?(1，0，1， (1，0，0， (1，0，0， (3，0，0， (0，0，1，
1) 1) 0) 1) 1) 0) 0)
(0，0，1， (1，0，0，?(2，0，0， (1，0，0， (2，0，0， (4，0，0， (0，0，1，
2) 1) 0) 2) 1) 0) 1)
16 (0，0，0， (0，0，0，?(0，0，0， (0，0，0， (0，0，0， N/A N/A
1) 0) 0) 0) 0)
(0，0，0， (0，0，0， (0，0，1， (0，0，0， (0，0，0，
2) 1) 0) 1) 1)
(0，0，1， (0，0，1， (1，0，0， (0，0，0， (1，0，0，
0) 0) 0) 2) 0)
(0，0，1， (0，0，1， (1，0，1， (1，0，0， (1，0，0，
1) 1) 0) 0) 1)
(0，0，1， (1，0，1， (2，0，1， (1，0，0， (2，0，0，
2) 1) 0) 2) 0)
17 (0，0，0， (0，0，0， N/A (0，0，0， N/A N/A N/A
0) 0) 0)
(0，0，0， (0，0，0， (0，0，0，
1) 1) 1)
(0，0，0， (0，0，1， (0，0，0，
2) 0) 2)
(0，0，1， (0，0，1，
0) 1) (1，0，0，
(0，0，1， (1，0，0， 0)
2) 0) (1，0，0，
1)
18 (0，0，0， (0，0，0， (0，0，0， (0，0，0， (0，0，0， (0，0，0， (0，0，0，
0) 0) 0) 0) 0) 0) 0)
(0，0，0， (0，0，0， (0，0，1， (0，0，0， (0，0，0， (1，0，0， (0，0，0，
1) 1) 0) 1) 1) 0) 1)
(0，0，0， (0，0，1， (1，0，0， (0，0，0， (1，0，0， (2，0，0， (0，0，0，
2) 0) 0) 2) 0) 0) 2)
(0，0，1， (0，0，1， (1，0，1， (1，0，0， (1，0，0， (3，0，0， (0，0，1，
0) 1) 0) 0) 1) 0) 0)
(0，0，1， (1，0，0， (2，0，0， (1，0，0， (2，0，0， (4，0，0， (0，0，1，
1) 1) 0) 1) 0) 0) 1)
(0，0，1， (1，0，1， (2，0，1， (1，0，0， (2，0，0， (5，0，0， (1，0，0，
2) 1) 0) 2) 1) 0) 2)
19 N/A (0，0，0， N/A N/A N/A N/A (0，0，0，
0) 0)
(0，0，0， (0，0，0，
1) 1)
(0，0，1， (0，0，0，
0) 2)
(0，0，1， (0，0，1，
1) 0)
(1，0，0， (0，0，1，
0) 1)
(1，0，1， (1，0，1，
0) 1)
20/30?(0，1，0， (0，1，0， N/A (0，1，0， (0，1，0， N/A (0，1，0，
1) 0) 1) 0) 1)
21/31?(0，2，0， (0，2，0， N/A (0，2，0， (0，2，0， N/A (0，2，0，
1) 0) 1) 0) 1)
22/32?(0，1，1， (0，1，1， N/A N/A N/A N/A (0，1，1，
1) 0) 0)
23/33?(0，0，0， (0，0，0， N/A (0，0，0， (0，0，0， N/A (0，0，0，
1) 0) 1) 0) 1)
24/34?(0，0，1， (0，0，1， N/A N/A N/A N/A (0，0，1，
1) 0) 0)
25/35?(0，0，0， (0，0，0， N/A (0，0，0， (0，0，0， N/A (0，0，0，
1) 0) 1) 0) 1)
(0，0，1， (0，0，1， (1，0，0， (1，0，0， (0，0，1，
1) 0) 1) 0) 0)
26/36?(0，0，0， (0，0，0， (0，0，0， (0，0，0， (0，0，0，
1) 0) N/A 1) 0) N/A 1)
(0，0，1， (0，0，1， (1，0，0， (1，0，0， (0，0，1，
1) 0) 1) 0) 0)
(1，0，0， (1，0，0， (2，0，0， (2，0，0， (1，0，0，
1) 0) 1) 0) 1)
27/37 (0，0，0， (0，0，0， (0，0，0， (0，0，0， (0，0，0，
1) 0) N/A 1) 0) N/A 1)
(0，0，1， (0，0，1， (1，0，0， (1，0，0， (0，0，1，
1) 0) 1) 0) 0)
(1，0，0， (1，0，0， (2，0，0， (2，0，0， (1，0，0，
1) 0) 1) 0) 1)
(1，0，1， (1，0，1， (3，0，0， (3，0，0， (1，0，1，
1) 0) 1) 0) 0)
28/38 (0，0，0， (0，0，0， (0，0，0， (0，0，0， (0，0，0，
1) 0) 1) 0) 1)
(0，0，1， (0，0，1， N/A (1，0，0， (1，0，0， N/A (0，0，1，
1) 0) 1) 0) 0)
(1，0，0， (1，0，0， (2，0，0， (2，0，0， (1，0，0，
1) 0) 1) 0) 1)
(1，0，1， (1，0，1， (3，0，0， (3，0，0， (1，0，1，
1) 0) 1) 0) 0)
(2，0，0， (2，0，0， (4，0，0， (4，0，0， (2，0，0，
1) 0) 1) 0) 1)
29/39 (0，0，0， (0，0，0， (0，0，0， (0，0，0， (0，0，0，
1) 0) 1) 0) 1)
(0，0，1， (0，0，1， N/A (1，0，0， (1，0，0， N/A (0，0，1，
1) 0) 1) 0) 0)
(1，0，0， (1，0，0， (2，0，0， (2，0，0， (1，0，0，
1) 0) 1) 0) 1)
(1，0，1， (1，0，1， (3，0，0， (3，0，0， (1，0，1，
1) 0) 1) 0) 0)
(2，0，0， (2，0，0， (4，0，0， (4，0，0， (2，0，0，
1) 0) 1) 0) 1)
(2，0，1， (2，0，1， (5，0，0， (5，0，0， (2，0，1，
1) 0) 1) 0) 0)
40 (0，1，0， N/A N/A (0，1，0， N/A N/A (0，1，0，
0) 0) 0)
41 (0，2，0， N/A N/A (0，2，0， N/A N/A (0，2，0，
0) 0) 0)
42 (0，1，1， N/A N/A N/A N/A N/A N/A
0)
43 (0，0，0， N/A N/A (0，0，0， N/A N/A (0，0，0，
0) 0) 0)
44 (0，0，1， N/A N/A N/A N/A N/A N/A
0)
45 (0，0，0， N/A N/A (0，0，0， N/A N/A (0，0，0，
0) 0) 0)
(0，0，1， (1，0，0， (1，0，0，
0) 0) 0)
46 (0，0，0， (0，0，0， (0，0，0，
0) N/A N/A 0) N/A N/A 0)
(0，0，1， (1，0，0， (1，0，0，
0) 0) 0)
(1，0，0， (2，0，0， (2，0，0，
0) 0) 0)
47 (0，0，0， (0，0，0， (0，0，0，
0) N/A N/A 0) N/A N/A 0)
(0，0，1， (1，0，0， (1，0，0，
0) 0) 0)
(1，0，0， (2，0，0， (2，0，0，
0) 0) 0)
(1，0，1， (3，0，0， (3，0，0，
0) 0) 0)
48 (0，1，0， (0，1，0， (0，1，0， (0，1，0， (0，1，0， (0，1，0， (0，1，0，
*) *) *) *) *) *) *)
49 (0，2，0， (0，2，0， (0，2，0， (0，2，0， (0，2，0， (0，2，0， (0，2，0，
*) *) *) *) *) *) *)
50 (0，1，1， (0，1，1， (0，1，1， N/A N/A N/A (0，1，1，
*) *) *) *)
51 (0，0，0， (0，0，0， (0，0，0， (0，0，0， (0，0，0， (0，0，0， (0，0，0，
*) *) *) *) *) *) *)
52 (0，0，1， (0，0，1， (0，0，1， N/A N/A N/A (0，0，1，
*) *) *) *)
53 (0，0，0， (0，0，0， (0，0，0， (0，0，0， (0，0，0， (0，0，0， (0，0，0，
*) *) *) *) *) *) *)
(0，0，1， (0，0，1， (0，0，1， (1，0，0， (1，0，0， (1，0，0， (0，0，1，
*) *) *) *) *) *) *)
54 (0，0，0， (0，0，0， (0，0，0， (0，0，0， (0，0，0， (0，0，0， (0，0，0，
*) *) *) *) *) *) *)
(0，0，1， (0，0，1， (0，0，1， (1，0，0， (1，0，0， (1，0，0， (0，0，1，
*) *) *) *) *) *) *)
(1，0，0， (1，0，0， (1，0，0， (2，0，0， (2，0，0， (2，0，0， (1，0，0，
*) *) *) *) *) *) *)
55 (0，0，0， (0，0，0， (0，0，0， (0，0，0， (0，0，0， (0，0，0， (0，0，0，
*) *) *) *) *) *) *)
(0，0，1， (0，0，1， (0，0，1， (1，0，0， (1，0，0， (1，0，0， (0，0，1，
*) *) *) *) *) *) *)
(1，0，0， (1，0，0， (1，0，0， (2，0，0， (2，0，0， (2，0，0， (1，0，0，
*) *) *) *) *) *) *)
(1，0，1， (1，0，1， (1，0，1， (3，0，0， (3，0，0， (3，0，0， (1，0，1，
*) *) *) *) *) *) *)
56 (0，0，0， (0，0，0， (0，0，0， (0，0，0， (0，0，0， (0，0，0， (0，0，0，
*) *) *) *) *) *) *)
(0，0，1， (0，0，1， (0，0，1， (1，0，0， (1，0，0， (1，0，0， (0，0，1，
*) *) *) *) *) *) *)
(1，0，0， (1，0，0， (1，0，0， (2，0，0， (2，0，0， (2，0，0， (1，0，0，
*) *) *) *) *) *) *)
(1，0，1， (1，0，1， (1，0，1， (3，0，0， (3，0，0， (3，0，0， (1，0，1，
*) *) *) *) *) *) *)
(2，0，0， (2，0，0， (2，0，0， (4，0，0， (4，0，0， (4，0，0， (2，0，0，
*) *) *) *) *) *) *)
57 (0，0，0， (0，0，0， (0，0，0， (0，0，0， (0，0，0， (0，0，0， (0，0，0，
*) *) *) *) *) *) *)
(0，0，1， (0，0，1， (0，0，1， (1，0，0， (1，0，0， (1，0，0， (0，0，1，
*) *) *) *) *) *) *)
(1，0，0， (1，0，0， (1，0，0， (2，0，0， (2，0，0， (2，0，0， (1，0，0，
*) *) *) *) *) *) *)
(1，0，1， (1，0，1， (1，0，1， (3，0，0， (3，0，0， (3，0，0， (1，0，1，
*) *) *) *) *) *) *)
(2，0，0， (2，0，0， (2，0，0， (4，0，0， (4，0，0， (4，0，0， (2，0，0，
*) *) *) *) *) *) *)
(2，0，1， (2，0，1， (2，0，1， (5，0，0， (5，0，0， (5，0，0， (2，0，1，
*) *) *) *) *) *) *)
As can be seen from Table 5, when time domain inadequate resource during with the PRACH number of channel that time division multiplexing was disposed, the time-domain position of many PRACH channels is identical, and will adopt frequency division multiplexing to shine upon these PRACH channels this moment on this time-domain position.In common sub-frame of uplink, the frequency domain mapping method of the PRACH channel of frequency domain multiplexing makes PRACH at frequency domain certain interval be arranged for to shine upon from the frequency band both sides to the centre, has diversity gain, and mapping method as shown in Equation (1); For the Random Access Channel on the UpPTS, the PRACH of frequency domain multiplexing alternately mapping of lower sideband on frequency band between two UpPTS, and on each UpPTS, a plurality of frequency domain PRACH are Continuous Mappings lower sideband or upper sidebands at frequency band, and mapping method as shown in Equation (2).
Wherein, n
PRB offset RAFrequency domain initial position for the PRACH channel; N
RB ULBe the corresponding RB number altogether of up-link bandwidth preparation; f
RAFrequency domain index for the identical PRACH channel of time-domain position;
Expression rounds downwards.n
fBe System Frame Number, N
SPIt is the transfer point number of downstream-to-upstream in the radio frames.
Can specifically indicate certain Random Access Channel in the radio frames with a random access channel resource index (PRACH resource index is called for short PRI).For FDD, PRI corresponds to the relative sequence number of the initial wireless sub-frame of PRACH in a radio frames.With PRACH configuration index 13 is example, and 5 PRACH subframes are arranged in a radio frames, and subframe numbers is respectively 1,3,5,7,9, and their PRI is respectively 0,1,2,3,4.Concerning TDD, PRI corresponds to the order that occurs in the corresponding PRACH channel set of PRACH configuration index in the form 5 and up/downstream arrangements combination.With PRACH configuration index 15 is example, if up/downstream arrangements is 0,5 initial subframes of PRACH in a radio frames can be represented with 5 four-tuple in the position of time domain and frequency domain so, are respectively (0,0 according to sequencing, 0,0), (0,0,0,1), (0,0,0,2), (0,0,1,1), (0,0,1,2), the PRI of their correspondences is respectively 0,1,2,3,4.
In the random access procedure of Fig. 1, the terminal at transmission random access guiding on the identical PRACH in the step 1 can be more than one or one.
In step 2, the time of reception window of regulation can represent that wherein window size is smaller or equal to 10ms with a time migration and window size.Such as time migration is 3ms, and window size is 5ms, and this just represents terminal from the 3ms that sends random access guiding later on, receiving random access response message in the time range of 5ms.
The base station is distinguished in the position of time domain and frequency domain according to the random access guiding of terminal transmission and the PRACH of transmission random access guiding, and in accidental access response message, give terminal relevant feedback information, be used for representing that the accidental access response message in the step 2 sends to that terminal.Wherein relevant in the position of time domain and frequency domain with PRACH information is represented with a random access radio network temporary mark (RA-RNTI), this sign is included on the Physical Downlink Control Channel that sends accidental access response message (PDCCH), specifically covers on the CRC of PDCCH information bit.And the relevant information of random access guiding is included on the PDCCH Physical Downlink Shared Channel pointed (PDSCH), specifically represents with the index of the random access guiding that terminal sent.
RA-RNTI and the corresponding relation of PRACH channel between the position of time domain and frequency domain are to represent with following formula among the present LTE:
RA-RNTI＝t_id+10*f_id
Wherein t_id represents the subframe numbers of the initial subframe of PRACH channel; F_id represents the sequence number that the PRACH channel is arranged according to ascending order in this subframe in frequency domain.For FDD, f_id always equals 0.For TDD, f_id is more than or equal to 0, less than 6.If two terminals send the PRACH of random access guiding in time at a distance of surpassing 10ms, so because the window size of LTE always is not more than 10ms, and time migration is the same, so the time of reception window of receiving random access response message can be not overlapping for these two terminals, so always can not obscure.If the PRACH of two terminal transmission random access guidings is no more than 10ms in time apart, need so to distinguish accidental access response message by the unique RA-RNTI of size.And above-mentioned corresponding relation has guaranteed that any two pairing RA-RNTI of PRACH channel inequality that are no more than 10ms in time apart are different.
This corresponding method needs to reserve 10 Radio Network Temporary Identifiers (RNTI) for FDD.For TDD, need to reserve 60 RNTI.And reality density of PRACH maximum for TDD is 6, just in the time range of a radio frames, occurs 6 PRACH channels at most.From the angle of RNTI resource present corresponding relation to little waste the resource of 90% RNTI.
The another one significant effects is the complexity of system.Terminal was obtained the configuration parameter of Random Access Channel from system message or dedicated signaling before the transmission random access guiding, comprise PRACH configuration index and up/downstream arrangements parameter.Terminal determines that according to these two parameters (as long as concerning FDD PRACH configuration index) the PRACH channel is in position that time domain and frequency domain may occur.The MAC of terminal (medium access control) layer protocol need become RA-RNTI to the time domain at selected PRACH channel place and the location map of frequency domain selecting (perhaps to have been specified by network) after certain PRACH channel sends random access guiding.Mac-layer protocol is notified to physical layer to this RA-RNTI when requiring physical layer to send random access guiding then.Physical layer sends the position of the PRACH channel of random access guiding reality at time domain and frequency domain according to RA-RNTI reflection ejaculation.This process is fairly simple for FDD, because the subframe numbers of RA-RNTI and the initial subframe of PRACH channel on time domain is the same.More complicated then for TDD, and comprised that mapping and reflection penetrate two processes.
If network specifies in the radio frames certain PRACH channel to give terminal, wherein method is to adopt PRI to specify certain PRACH channel in one.Mac-layer protocol need be mapped to RA-RNTI to this PRI, notifies physical layer then.Physical layer penetrates the position of the PRACH channel of transmission random access guiding reality at time domain and frequency domain from the RA-RNTI reflection again.
Summary of the invention
At defective that exists in the prior art and deficiency, the technical problem to be solved in the present invention is to propose accidental access method in a kind of LTE system with solving the above-mentioned RNTI wasting of resources, and the problem of the complexity that causes to interoperability between the wireless protocols MAC layer of terminal and the physical layer of described RA-RNTI.
For solving the problems of the technologies described above, technical scheme of the present invention is: the accidental access method in a kind of LTE system, terminal sends after the random access guiding on Physical Random Access Channel, receiving random access response message in the time of reception window of regulation is characterized in that: the Physical Downlink Control Channel that described terminal monitoring is relevant with described accidental access response message; Described Physical Downlink Control Channel comprises a Radio Network Temporary Identifier; Described Radio Network Temporary Identifier equal to send the resource index of described Physical Random Access Channel of described random access guiding and a deviant and.
Further, the resource index of described Physical Random Access Channel is the unified numbering of described Physical Random Access Channel in radio frames, the described Physical Random Access Channel of the initial subframe unified numbering of described Physical Random Access Channel in radio frames is meant to(for) FDD in radio frames according to increasing the relative sequence number that preface is arranged; The described Physical Random Access Channel of the initial subframe unified numbering of described Physical Random Access Channel in radio frames is meant to(for) TDD is the tactic relative sequence number of frequency domain after the position of time domain and frequency domain is according to first time domain.
Further, the size of described time of reception window is no more than 10 milliseconds, and described time of reception window is broadcasted by system message, perhaps sends to described terminal by dedicated signaling, and described terminal is initiating to obtain described time of reception window parameter before the access at random.Described deviant can be 0 or greater than 0 constant, its length is fixed, and the length of described Radio Network Temporary Identifier and described deviant is 16 bits.
Further, described Physical Downlink Control Channel comprises the downlink radio resource configuration information, be used to refer to the time-frequency domain Radio Resource of Physical Downlink Shared Channel to the described accidental access response message of carrying, described Physical Random Access Channel be described terminal oneself freely select or by network by the dedicated signaling appointment or in the scope of network appointment, freely select.
Adopt accidental access method of the present invention, reduced the resource of the RA-RNTI that reserves, reduced the complexity of the interoperability between MAC layer and the physical layer, also simplified the process of MAC layer processing RA-RNTI simultaneously.
Description of drawings
Accompanying drawing is used to provide further understanding of the present invention, and constitutes the part of specification, is used from explanation the present invention with embodiments of the invention one, is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is the flow chart that inserts at random;
Fig. 2 A is the frame structure schematic diagram of Type 1 in the embodiment of the invention;
Fig. 2 B is the frame structure schematic diagram of Type 2 in the embodiment of the invention;
Fig. 3 is the structural representation of PRACH channel in the embodiment of the invention.
Embodiment
The following stated embodiment is applied to the random access procedure based on conflict, also can be applied to the random access procedure based on non-conflict.For the random access procedure based on conflict, terminal oneself selects a PRACH channel to send random access guiding.For the random access procedure based on non-conflict, network can be given the random access guiding of a special use of terminal distribution, and the Random Access Channel mask index relevant with this special-purpose random access guiding.PRI or certain combination of PRACH channel of interior certain a PRACH channel of radio frames represented in this Random Access Channel mask index, such as PRACH channels all in the radio frames, perhaps such as the PRACH channel on the PRACH time slot of odd number or even number position.The PRACH time slot is meant the position of wireless sub-frame on time domain that comprises the PRACH channel.
Random access procedure based on conflict can be used for Radio Resource control (RRC) establishment of connection, process of reconstruction, and upstream data arrives the random access procedure that triggers.
Can be used for downlink data based on the random access procedure of non-conflict reaches or switches the random access procedure that causes.Always begin this process by dedicated signaling notice terminal by network.
Terminal is after having determined to send the PRACH channel of random access guiding, and RA-RNTI is set to and the PRI of this PRACH channel correspondence, i.e. RA-RNTI=PRI+RNTI-OFFSET, and wherein RNTI-OFFSET is one and is greater than or equal to 0 constant.The PRI of PRACH channel correspondence is unique in a radio frames, so can guarantee that also any two different pairing RA-RNTI of PRACH channel that are no more than 10ms in time apart can be not the same.Among the following embodiment, RNTI-OFFSET=0.
Suppose that the PRACH configuration index is 12 in certain LTE sub-district, the size of receive window is 6ms.The subframe numbers of the initial subframe of PRACH of this configuration index correspondence is respectively 0,2,4,6,8.The PRI of their correspondences is respectively 0,1,2,3,4.Suppose that terminal connect to initiate random access procedure in order to set up RRC, and to have selected initial subframe number be that 2 PRACH channel sends at random and inserts, this random access procedure is so so:
Suppose that the PRACH configuration index is 18 in certain LTE sub-district, the size of receive window is 10ms, and up/downstream arrangements is 1.The four-tuple of the initial subframe of PRACH of this configuration index correspondence is respectively (0,0,0,0), (0,0,0,1), (0,0,1,0), (0,0,1,1), (1,0,0,1), (1,0,1,1).The PRI of their correspondences is respectively 0,1,2,3,4,5.Suppose that terminal connect to initiate random access procedure in order to set up RRC, and to have selected PRI be that 5 PRACH channel sends at random and inserts, this random access procedure is so so:
Step 21, it is that to send an index on 5 the PRACH channel be 37 random access guiding that terminal is selected PRI at mac-layer protocol, and the RA-RNTI of correspondence is set to 5.The random access guiding of selecting, parameters such as corresponding RA-RNTI and transmitted power notice physical layer requires physical layer to send this random access guiding on selected PRACH channel then;
Step 22, the physical layer of terminal are 1 at PRACH at the index of frequency domain according to RA-RNTI, and subframe numbers is to have sent after the random access guiding on 8 the PRACH channel, receives an accidental access response message in receive window.Wherein the RA-RNTI on the Dui Ying PDCCH channel equals 5.So the PDSCH that physical layer obtains decoding goes up the transmission block of carrying and gives the mac-layer protocol processing entities;
Step 23 comprises in the accidental access response message that the MAC layer of terminal is determined to receive and is numbered 37 access lead index immediately, so acknowledged receipt of and the accidental access response message of the random access guiding correspondence of own transmission.
Suppose that the PRACH configuration index is 12 in certain LTE sub-district, the size of receive window is 6ms.The subframe numbers of the initial subframe of PRACH of this configuration index correspondence is respectively 0,2,4,6,8.The PRI of their correspondences is respectively 0,1,2,3,4.Suppose that terminal is in the RRC connection status, but lost uplink synchronous.Network descending have data to arrive buffering in, initiate random access procedure by PDCCH channel notification terminal, this random access procedure is so so:
Step 30, base station are that to send index on 3 the PRACH channel be 37 random access guiding at PRI by PDCCH channel notification terminal;
Step 31, terminal is after receiving this PDCCH signaling, the RA-RNTI that the MAC layer is corresponding is set to 3, then the random access guiding of network requirement, parameters such as corresponding RA-RNTI and transmitted power notice physical layer requires physical layer to send this random access guiding on selected PRACH channel;
Step 32, the physical layer of terminal be according to RA-RNTI, at subframe numbers is after having sent random access guiding on 6 the PRACH channel, to receive an accidental access response message in receive window.Wherein the RA-RNTI on the Dui Ying PDCCH channel equals 3.So the PDSCH that physical layer obtains decoding goes up the transmission block of carrying and gives the mac-layer protocol processing entities;
Step 33 comprises in the accidental access response message that the MAC layer of terminal is determined to receive and is numbered 37 access lead index immediately, so acknowledged receipt of and the accidental access response message of the random access guiding correspondence of own transmission.
Suppose that the PRACH configuration index is 18 in certain LTE sub-district, the size of receive window is 10ms, and up/downstream arrangements is 1.The four-tuple of the initial subframe of PRACH of this configuration index correspondence is respectively (0,0,0,0), (0,0,0,1), (0,0,1,0), (0,0,1,1), (1,0,0,1), (1,0,1,1).The PRI of their correspondences is respectively 0,1,2,3,4,5.Suppose that terminal is in the RRC connection status, and network is want this terminal is switched to Target cell.Target cell sends a RRC by the cell-of-origin and connects reallocation message, and the notice terminal is switched.This random access procedure is so so:
Step 40, it is that to send index on 2 the PRACH channel be 37 random access guiding at PRI that Target cell connects designated terminal in the reallocation message at RRC
Step 41, terminal are after receiving this message, and the RA-RNTI that mac-layer protocol is corresponding is set to 2.The random access guiding of network requirement, parameters such as corresponding RA-RNTI and transmitted power notice physical layer requires physical layer to send this random access guiding on selected PRACH channel then;
Step 22, the physical layer of terminal are 0 at PRACH at the index of frequency domain according to RA-RNTI, and subframe numbers is to have sent after the random access guiding on 7 the PRACH channel, receives an accidental access response message in receive window.Wherein the RA-RNTI on the Dui Ying PDCCH channel equals 2.So the PDSCH that physical layer obtains decoding goes up the transmission block of carrying and gives the mac-layer protocol processing entities;
Step 23 comprises in the accidental access response message that the MAC layer of terminal is determined to receive and is numbered 37 access lead index immediately, so acknowledged receipt of and the accidental access response message of the random access guiding correspondence of own transmission.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (11)
1. the accidental access method in the LTE system, terminal sends after the random access guiding on Physical Random Access Channel, receiving random access response message in the time of reception window of regulation is characterized in that: the Physical Downlink Control Channel that described terminal monitoring is relevant with described accidental access response message; Described Physical Downlink Control Channel comprises a Radio Network Temporary Identifier; Described Radio Network Temporary Identifier equal to send the resource index of described Physical Random Access Channel of described random access guiding and a deviant and.
2. method according to claim 1 is characterized in that, the resource index of described Physical Random Access Channel is the unified numbering of described Physical Random Access Channel in radio frames.
3. method according to claim 2 is characterized in that, the described Physical Random Access Channel of the initial subframe unified numbering of described Physical Random Access Channel in radio frames is meant to(for) FDD in radio frames according to increasing the relative sequence number that preface is arranged.
4. method according to claim 2, it is characterized in that the described Physical Random Access Channel of the initial subframe unified numbering of described Physical Random Access Channel in radio frames is meant to(for) TDD is the tactic relative sequence number of frequency domain after the position of time domain and frequency domain is according to first time domain.
5. method according to claim 1 is characterized in that, the size of described time of reception window is no more than 10 milliseconds.
6. according to claim 1 or 5 described methods, it is characterized in that described time of reception window is broadcasted by system message, perhaps sends to described terminal by dedicated signaling, described terminal is initiating to obtain described time of reception window parameter before the access at random.
7. method according to claim 1 is characterized in that, described deviant can be 0 or greater than 0 constant, its length is fixed.
8. method according to claim 1 is characterized in that, the length of described Radio Network Temporary Identifier and described deviant is 16 bits.
9. method according to claim 1 is characterized in that described Physical Downlink Control Channel comprises the downlink radio resource configuration information, is used to refer to the time-frequency domain Radio Resource to the Physical Downlink Shared Channel of the described accidental access response message of carrying.
10. method according to claim 1 is characterized in that, described Physical Random Access Channel be described terminal oneself freely select or by network by the dedicated signaling appointment or in the scope of network appointment, freely select.
11. method according to claim 1 is characterized in that, described random access guiding to be terminal oneself select according to certain principle or by network by the dedicated signaling appointment.
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